Method of producing clutch drums



April 10, 1928.

H. S. MaGCHESNEY METHOD 0F PRODUCING CLUTCH DRUMS Filed May 6. 1927 Patented Api". l0, 1928.

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, ject of the invention is to vUNITE STATES, f

HAROLD s.' IMACCHESNEY, or NEW YORK,

ATEN; osrigcs.

l N. Y., AssIeNoR To AMERICAN CAR AND 1 EoUNDRY COMPANY, or. NEW YORK, N. Y.,'A.CoREoRA'rIoN oENEW JERSEY.

METHOD or PRODUCING CLUTCH DRUMS;

' Application filed May 6,l

The accompanyingdrawings illustrate the preferred form 'of the invention, though it is to be understood that the invention is not limited to the exact 4details of construction shown and described, as it is obvious that vvarious modifications thereof vwithin the scope of the claims willy occur to persons Vskilled in the art.

In said drawings z' Fig. l is a1 vertical sectional view on line fl-f-l of F ig.v 2, illustrating a friction clutch whose clutch drum is producedthrough the instrumentality of my improved method;

Fig. l2 is an elevational view of the same showing parts broken away; l

Fig. 3 is a fragmentary top planl view of the blank after the casting operation and from which the clutch drum is subsequentlyy formed; j Fig. is ya fragmentary -sectional viewtaken on line 4 4 of Fig. 3; and Fig. 5 is a transverse sectional view of one of the friction clutch plates embodied in the assemblyillustrated in Fig. 1.

This invention -is a method yfor producing clutch drums for power clutches, and an obprovide ya' `simple and inexpensive method of producing Ithese clutch drums embodying a few simple operations. k In accordance'with the herein-described lmethod,a cylindrical blankv or casting' 11 is lirst cast with spaced longitudinal pe` ripheral grooves 12 whose ends stop short of the ends of the casting as shown Vbest in Fig. 3.

l The blank or casting 1l is then cleaned in any suitablek manner, as by means of a rotating vbrush to remove all the molding sand from `the slots 12. It is then locked in'- position in a suitable lgear-cutting machine best shown 1n Fig. 2.

adapted tol cut internalgear teeth, and the hub or gear-cutting tool is brought into action in such relation to the'blankthat the metal 1 2n at the bottom of the grooves 12 is cut through by said cutting tool therebyV forming the bevel-faced ribs 15 spaced apart bythelongitudinally extending 'slots 16 as Thus'the slots 16 and ribs 15 are formed by a combined casting and cutting process without the necessityof cutting through the major-thickness ofthe drum to form ventilating slots as 16; yand as thel metal is cut for onl)7 a small part of lits maximum thicka longitudinal `my hand.l

1927.' serial No. 189,293.

ness by the gear cutters, vthe drum is sub'- jecte'd to ,minimuml stresses .with theresult that only a small percentage ofv finished rums are cracked in the tion. ,i As illustrated in Figs.` land 2, the clutch rplurality of friction process of producassembly includes l a disks 17 having spaced teethmeshing-With the pins 17a and cooperating plates having radial teeth -18' meshing with the teeth or ribs l5 and rotatable with 19 fixed to a shaft plates are in frictional engagement, the

clutchl member 19 is rotated todrive the' shaft 20 from the-clutch drum through the instrumentality of the friction disks.`

yThat is claimed is: y 1. The method! of form-ing clutch drums, consisting,l of castingl a cylindrical blank with spacedl grooves in its peripheral face,

a clutch member' 20. W'hen .the clutch'L and subsequentlycuttingthrough the blank from its interior into all of such groovesV to provide spaced. longitudinal teeth upon the interior of the blank. f i.

2,v The method of producing internally toothed drive elements, consisting of forming a drive .element blank with a' pluralityof spaced longitudinal and subsequently cutting lthrough lthe bottoms ofthe grooves to formfspaced longigrooves in itsperiphery,

tudinal internal teeth and a'longitudinal airinlet slot' between eachpair of teeth.

3. lThe method of produc-ing clutch drums for friction disk clutches, consisting of casting a clutch drum of grooves, and subsequently cutting entirely through theV blank produce spaced longitudinal teeth and an air-inlet slot between each two adjacent teeth through which air can pass.

blank with a plurality" longitudinal cir'c'umferentia-lly spaced and into ea'chfgroove to 4. The method of producing clutchv drums,

consisting of casting a clutch drum blank with a plurality ofcircumferentially spaced grooves'in its peripheral face, leaving an uninterrupted continuous metal Wall upon the interior of the blank, and subsequently cutting through the continuous y wall to form spaced longitudinal teeth upon t its `inner face and changing the grooves into longitudinal air-inlet slots, one of which slots is located between each twoadjacentl teeth.

In witness whereof I l HAROLD s. MACCHESNEY.

have hereunto setL 

